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@Gordon
Sorry just read the title - this is on a Pico?
To detect a button press, you probably want
edge:'rising'?Are you using an up to date firmware? I know some earlier ones had issues with debouncing.
Also, is that the only code you're running? Could be be that the pin state on
BTN(which is actually pinC13) could be being reset to a pure input somehow? By default it is ininput_pulldownmode, which uses an internal resistor to stop it floating when the button isn't pressed.